<?php
namespace sycapi\tools;


class Time{
    static public function getDefaultTimeString($time=""){
        if (empty($time)){
            return date("Y-m-d H:i:s") ;
        }
        return date("Y-m-d H:i:s", $time) ;
    }
    /**
     * 返回今日开始和结束的时间戳
     */
    public static function today(){
        return [
            mktime(0, 0, 0, date('m'), date('d'), date('Y')),
            mktime(23, 59, 59, date('m'), date('d'), date('Y'))
        ];
    }

    /**
     * 返回昨日开始和结束的时间戳
     * @return array
     */
    public static function yesterday(){
        $yesterday = date('d') - 1;
        return [
            mktime(0, 0, 0, date('m'), $yesterday, date('Y')),
            mktime(23, 59, 59, date('m'), $yesterday, date('Y'))
        ];
    }

    /**
     * 返回本周开始和结束的时间戳
     */
    public static function week(){
        $timestamp = time();
        return [
            strtotime(date('Y-m-d', strtotime("+0 week Monday", $timestamp))),
            strtotime(date('Y-m-d', strtotime("+0 week Sunday", $timestamp))) + 24 * 3600 - 1
        ];
    }

    /**
     * 返回上周开始和结束的时间戳
     */
    public static function lastWeek(){
        $timestamp = time();
        return [
            strtotime(date('Y-m-d', strtotime("last week Monday", $timestamp))),
            strtotime(date('Y-m-d', strtotime("last week Sunday", $timestamp))) + 24 * 3600 - 1
        ];
    }

    /*
     * 返回本月开始和结束的时间戳
     */
    public static function month($everyDay = false){
        return [
            mktime(0, 0, 0, date('m'), 1, date('Y')),
            mktime(23, 59, 59, date('m'), date('t'), date('Y'))
        ];
    }


    /**
     * 返回上个月开始和结束的时间戳
     */
    public static function lastMonth(){
        $begin = mktime(0, 0, 0, date('m') - 1, 1, date('Y'));
        $end = mktime(23, 59, 59, date('m') - 1, date('t', $begin), date('Y'));
        return [$begin, $end];
    }

    /**
     * 返回今年开始和结束的时间戳
     */
    public static function year(){
        return [
            mktime(0, 0, 0, 1, 1, date('Y')),
            mktime(23, 59, 59, 12, 31, date('Y'))
        ];
    }

    /**
     * 返回去年开始和结束的时间戳
     *
     * @return array
     */
    public static function lastYear(){
        $year = date('Y') - 1;
        return [
            mktime(0, 0, 0, 1, 1, $year),
            mktime(23, 59, 59, 12, 31, $year)
        ];
    }

    public static function dayOf(){}

    /**
     * 获取几天前零点到现在/昨日结束的时间戳
     */
    public static function dayToNow($day = 1, $now = true){
        $end = time();
        if (!$now) {
            list($foo, $end) = self::yesterday();
        }
        return [
            mktime(0, 0, 0, date('m'), date('d') - $day, date('Y')),
            $end
        ];
    }

    /**
     * 返回几天前的时间戳
     */
    public static function daysAgo($day = 1){
        $nowTime = time();
        return $nowTime - self::daysToSecond($day);
    }

    /**
     * 返回几天后的时间戳
     */
    public static function daysAfter($day = 1){
        $nowTime = time();
        return $nowTime + self::daysToSecond($day);
    }

    /**
     * 天数转换成秒数
     */
    public static function daysToSecond($day = 1){
        return $day * 86400;
    }

    /**
     * 周数转换成秒数
     */
    public static function weekToSecond($week = 1){
        return self::daysToSecond() * 7 * $week;
    }

    private static function startTimeToEndTime(){}

}